dilsemonkWell, it asked me some good questions and I am working on these.
What is the purpose of the useEffect hook, and how does it differ from lifecycle methods in class components like componentDidMount, componentDidUpdate, and componentWillUnmount?
How does the dependency array in useEffect work? Can you explain what happens when you pass different types of dependencies, such as an empty array, a specific state variable, or leave the array undefined?
Describe a scenario where forgetting to include a dependency in the useEffect hook’s dependency array might lead to bugs. How would you debug such an issue?
How can you prevent the useEffect hook from running on the initial render, but only run on updates? Can you provide an example of this?
Explain how you can handle asynchronous operations within a useEffect hook. What potential issues can arise when dealing with async functions, and how can you manage them?
What is the significance of the cleanup function in useEffect? Provide an example of when and why you would use it.
How would you implement polling (repeatedly fetching data at intervals) using the useEffect hook? What considerations must you keep in mind to avoid potential issues like memory leaks?
Imagine you’re working with a useEffect hook that depends on a value from useContext. How would you handle scenarios where the context value changes frequently? What strategies can you employ to optimize performance?
What challenges might arise when using useEffect to sync state with local storage? How would you ensure that the effect runs consistently across different environments, such as server-side rendering or during hydration?
Can you think of any scenarios where you would intentionally leave the dependency array of useEffect empty or undefined? What are the risks involved, and how do you mitigate them?
How would you test a component that heavily relies on useEffect using tools like Jest or React Testing Library? What specific strategies or tools would you use to mock asynchronous operations or side effects?
Discuss a situation where you might want to cancel a network request inside a useEffect hook. How would you implement that cancellation in React?
How can useEffect be used to update the document title based on component state? What should you consider to ensure that the title is updated correctly and doesn’t lead to unnecessary performance issues?
Have you encountered any common anti-patterns when using useEffect? How would you refactor code that misuses useEffect to follow best practices?
Imagine you have a complex component with multiple useEffect hooks, each handling different side effects. How do you manage and organize these effects to maintain readability and reduce potential bugs?
